Author(s): Hu Xiasong; Fu Jiangtao; Zhou Guoying; Xu Wenhua; Chen Guichen; Li Guorong; Liang Tong; Zhu Haili; Yu Qinqin; Qiao Na; Lu Haijing
Linked Author(s):
Keywords: Qinghai-Tibet railway; Tuotuohe river region; Gravel-soil-erosion field; Herbs; Root mechanical strength; Reinforced soil effect
Abstract: The Tuotuohe river region gravel-soil-erosion field along the Qinghai-Tibet railway was taken as the test site, where some dominating species were planted, and single root tensile and shear test we re carried out to study the soil reinforcement capability by six herb species with five-year growth period. The testing results show the single root tensile resistance value is 4. 44-2. 99N, and single root shear resistance value is 4. 33-3. 85N. At the meantime, the fitted equations between root diameter and single root tensile resistance, tensile strength, shear resistance, shear strength were also established. Besides, the relationships between tensile stress and strain of six herbs species were analyzed. The results show that there exists a linear relation between single root resistance and root diameter, power relations exist between single ro ot tensile strength and root diameter, and the single root strength decreases with the diameter increasing. The stress-strain curves of six herbs roots present linear relation, which reflects the linear elastic characteristics. Also, the power relatio ns exist between single root shear resistance, shear strength and root diameter, and the single root shear strength decre ases with the diameter increasing. According to the strengths of the six herbs, the reinforced soil mechanical effectiveness of the six five-year growth period herbs for slope protection have been proved.
Year: 2013